# ProxyTunnelHandler.java

    /*
     *  Licensed to the Apache Software Foundation (ASF) under one
     *  or more contributor license agreements.  See the NOTICE file
     *  distributed with this work for additional information
     *  regarding copyright ownership.  The ASF licenses this file
     *  to you under the Apache License, Version 2.0 (the
     *  "License"); you may not use this file except in compliance
     *  with the License.  You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     *  Unless required by applicable law or agreed to in writing,
     *  software distributed under the License is distributed on an
     *   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     *  KIND, either express or implied.  See the License for the
     *  specific language governing permissions and limitations
     *  under the License.
     */
    package org.apache.synapse.transport.http.conn;

    import java.io.IOException;

    import org.apache.http.HttpException;
    import org.apache.http.HttpHost;
    import org.apache.http.HttpRequest;
    import org.apache.http.HttpRequestInterceptor;
    import org.apache.http.HttpResponse;
    import org.apache.http.HttpVersion;
    import org.apache.http.HttpHeaders;
    import org.apache.http.client.protocol.RequestClientConnControl;
    import org.apache.http.conn.routing.HttpRoute;
    import org.apache.http.message.BasicHttpRequest;
    import org.apache.http.nio.NHttpClientConnection;
    import org.apache.http.protocol.HttpContext;
    import org.apache.http.protocol.HttpProcessor;
    import org.apache.http.protocol.ImmutableHttpProcessor;
    import org.apache.synapse.transport.passthru.RouteRequestMapping;

    public class ProxyTunnelHandler {

        private final RouteRequestMapping routeRequestMapping;
        private final ClientConnFactory connFactory;
        private final HttpProcessor httpProcessor;

        private volatile boolean requested;
        private volatile boolean completed;
        private volatile boolean successful;

        public ProxyTunnelHandler(
                final RouteRequestMapping routeRequestMapping,
                final ClientConnFactory connFactory) {
            super();
            this.routeRequestMapping = routeRequestMapping;
            this.connFactory = connFactory;
            this.httpProcessor = new ImmutableHttpProcessor(new HttpRequestInterceptor[] {
                new RequestClientConnControl()
            } );
        }

        public HttpRequest generateRequest(final HttpContext context) throws IOException, HttpException {
            HttpHost target = this.routeRequestMapping.getRoute().getTargetHost();
            HttpRequest connect = new BasicHttpRequest("CONNECT", target.toHostString(), HttpVersion.HTTP_1_1);
            connect.setHeader(HttpHeaders.HOST, target.toHostString());
            this.httpProcessor.process(connect, context);
            context.setAttribute(SynapseHTTPRequestFactory.ENDPOINT_URL, target.toString());
            return connect;
        }

        public void setRequested() {
            this.requested = true;
        }

        public boolean isRequested() {
            return this.requested;
        }

        public void handleResponse(final HttpResponse response, final NHttpClientConnection conn) {
            this.completed = true;
            int code = response.getStatusLine().getStatusCode();
            if (code >= 200 && code < 300) {
                this.successful = true;
                HttpRoute route = routeRequestMapping.getRoute();
                if (route.isLayered() && conn instanceof UpgradableNHttpConnection) {
                    this.connFactory.upgrade((UpgradableNHttpConnection) conn, routeRequestMapping);
                }
            } else {
                this.successful = false;
            }
        }

        public boolean isCompleted() {
            return this.completed;
        }

        public boolean isSuccessful() {
            return this.successful;
        }

        public HttpHost getProxy() {
            return this.routeRequestMapping.getRoute().getProxyHost();
        }

    }